bump version to 1.5.2
diff --git a/six.py b/six.py
index fee090d..7ec7f1b 100644
--- a/six.py
+++ b/six.py
@@ -25,7 +25,7 @@
 import types
 
 __author__ = "Benjamin Peterson <benjamin@python.org>"
-__version__ = "1.5.1"
+__version__ = "1.5.2"
 
 
 # Useful for very coarse version differentiation.